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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a259ea181c557798eb6d75adf6b9b8f27f08ec42d9353f4d5ff580dc7ea4614d' 
  AND token = 'C9HzdwN4mx8p7+/UwtU+AbiymtQfEhAWMsTtv7HenXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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