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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20cd7c4fcbf5229b3a3f1e7f2594cecacbc625280906921b4401d73ccdc82e3' 
  AND token = 'h7HHrZcYGnjXnF+mM07Mg+H5jkyJGhQj/j0d8575NNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}