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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc896a88bd87ecd1bee93babdaac4ef4846f77b2814d1d8eaa99a742cba951f0' 
  AND token = 'wX6iCm1tKcYawZJtL1oHy0rKkkr8j/gaoj2RRQZJ2XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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