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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'defb672220a35852306299fa80b2472428fcc90731936e99891d77e8e9e71300' 
  AND token = 'Po8D8A6YstZUq+3HTC72ksV/LcarpRqL7c2TWk+PjLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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