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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a71f16c5a19a7f6da2ee8c8316a60b5513d0b913c26d23909dbb9bf763648f4' 
  AND token = 'fW/gW0UONu991/pP1vymcvIGy403OqtMgOahVleMmpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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