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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e9acc23324b01653e9c76b7096c43404312303a07e5128ac0f552f575c10fcd' 
  AND token = 'cwAbQmBblvO6DgVRLETU279RvPQEU1ToRC6dGZRnSj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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