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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e9db872b0a62eef7cde94ffc842131566ebb3edd3c4a0b6d532f7eaa2138db' 
  AND token = 'qBOGDw6xGoIRBAKTwINM6a7oGgkvssaOCEQeM7KhQLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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