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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3077245952e3cc28bf0f86bcd766d588e8756c940fa554fa4df5586fd82a5190' 
  AND token = 'H3RMrN1sn8nd4vQSNje9xzfBjZZNURekREfDpKEy88U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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