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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735b9627a083c314ba02a441ab9b9b0c41fb0ae8357bc4d2a85fbe794bd3693a' 
  AND token = 'INhxAs9ySgT5CM/mALi8nWzlXLqT87PvmnakqHiWL5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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