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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f001350b281bb2c4f960b1a3ab3c2cf2200bc5909c1ab3a50c9aaa5139df0eb6' 
  AND token = 'z4gkTNNGnGpzqWEepTtCRGYncyC5/w1gGPLf7v/o9L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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