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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41b77caa78a92e65ace6ad7044dc2560f21b671c976a61834f08998f9786f2b' 
  AND token = '04CNyADt8gwpDU7BvbZUX3BtWOJHXuejHH/LdLuDDFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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