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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58867d9d982183b79d5d56271ee837bbf4dc484048d763225a4176ebc8e1127' 
  AND token = 'grxFI/Oh5YaMJZL2Y42mggZhSccygEQ7pAqkO87OfOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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