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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7057cf5ab2367b10912829d5cfec5d6cb02769f09b727a5de093d1325f179b03' 
  AND token = 'FFvhghGvr3a4ktwaWQcd81Z68K4y0r1fSvo4uhJWCxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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