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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00776f84728b121cbe2b6ae48239079eadd43bb73893eeff3e919e7c5cbc51ec' 
  AND token = 'g8l6b7uSqmfw+Lo63+s5YFMc3om30nnOJRCIzXnMgEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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