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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58aa03210d1030cba1eac1f98a669011df7a24c972194330eb8884ce95ec2b20' 
  AND token = 'fCBHxv3uHdT7xrfu62y2F/9q2qwlU2dvIB6G5tLhKlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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