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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7df0c3e365e076d6b8677133e9b13173c4f45ce2c0164d2e333d31607b5397' 
  AND token = 'bsu154oY9RqkeuCpvuz2H0VTzIysFfn31Imllbw1p2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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