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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c14b3b89d4f2122aa720f65e7e256a38cf0abf5b5718f4c9f40d69e09c2a95c' 
  AND token = 'Qe5pebZ8vPfx/LvM0uITjEN6nelGJET8Dhj7uCilMxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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