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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4b73db4b68c386dcd90346a2e1ad6b6b930212a6b73fdc8fa2e677871c2f11' 
  AND token = '9Hj9gcJwMuiff2AzxW9ZiwcQ9TpjstXs9kqVUClXvig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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