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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7843705ffa8eef37b16a055d825d565ad7d2b85c9259cd99c6cdb9feec22994' 
  AND token = 'Pup2cKgmB4AjRYOhrqjW5Mq8NeI1HTT+V2J7WkV6giY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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