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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ecb4f667426a0b9ee62f8d937fc67b65945c3bf076c6a3717e905b9dd14339' 
  AND token = 'BjOdM+fy3BKoug8wpoD67F4LmTwnNCeceT/ozv3BhTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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