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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030fa2cbf0eeea322960fc90710446ffdf3b0a1d99ced51c4c3deead1a59a2b3' 
  AND token = 'k8iVb2J1I9L167qZgKNGqKrFyf5PiMz/eWa9tRFih2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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