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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30b6cc5e559a993956c9fe15e3e3ca037b564bc4156f7b4242e39b04c46b07d' 
  AND token = 'dDOJ9cwCCcVyZfJ3mHqVp8xv+AFuLyUjscZpBMyWfyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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