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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c4267cf36260fd1dcff6946554bda11d9a438a7ea8d2a9cc9e6532636cc0a8' 
  AND token = 'Q92h7w2mIp54z042fO3duZT8Q6u0zfKxFfZqiL4g3oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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