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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae1a882e54ea0578758d13b54e691bda9cb0ef15272fa966be96b8831f7e30a' 
  AND token = 'f7ap8KligfSfSps4afIBDgRffzLHi3XqY6reMImB7WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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