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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6eccfc1ba4ac9c3db2da6810f633ebe4bc8af391ae2ec37e46f278f6f8af793' 
  AND token = 'y13nPt1wEJ5ektkuIm+CwUDyVRW7KEznq9RBh2/zj6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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