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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e333dc67e14b8292abc4de2e48c6be629c3ba3909959e2904729bea738f85f3a' 
  AND token = 'gNL66VWCSlzDWQPRlcl7CfrcMn9FnamaJy6b0YUtahE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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