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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceffcd65078639c8a42d5b997cfe8f60286a148137a047f329fc3422d6d54f57' 
  AND token = '8t8JuDr4x/6bYMkWyIqASmoxEK79cF2dBsc2xllJzKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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