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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029800de2212e01139dc671c18554bc8253deab2ef8100153dec7f6b7e53936a' 
  AND token = 'C1t50Q+02AyyOdZuoQmt0PPgnhDYYuWEO1LwzHtwd2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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