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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e7f1b104d13135b3c88321ed0a5b6d5179c0de1f3287ab10656ba40b8b06e6' 
  AND token = 'MDkX7vzSACnYG3HsrKbke6RrKzX9ctsPI4FDFJsEbNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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