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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24d298b1c3e8e4b4ac0d22569864039a00a13d63a17ed35add64acb736c21c1' 
  AND token = '2gm0WI4yfG2ZuFDJP8rCKT/ajW06QL3cNOLPUkFLlAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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