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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9a42057674dad501f9ef4b97ad80f111666728345d42aa46f5dee00a6daf71' 
  AND token = '6RHh9YzEbfI2wG4HgbiUWqwQXav50U+yWrgpDTUCKmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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