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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3090e9da9ceb2e24d4b64dab3235b2ae39d5d3ec02602f33cced0d2ceffebe75' 
  AND token = '5jGjO/kzZlJdTLK97Eb8bHH5+Fqz4zNEEXIHxAacVRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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