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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9442400c30590e7ba8327308789dd3fc3eec878a42fd66c9081433a48314ffe1' 
  AND token = 'RX3pjHMWsgb1ZV53A54Jtp5cch0PAuH/gQmqWsf0e8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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