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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852fe3648d6db6a2366fe49f4438edd45b93b9a8dd2f0e1519a12b2f6702cc3d' 
  AND token = '5E/UDFMVy2vDr/uOkWhTXd9M+jPl8RxZIox4dhTawvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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