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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '496198c45c3a18cdb91f1208140e40a66b49efc6cbb1238a9c0377e2080b8be5' 
  AND token = 'hnd+LxPr920aR03uTMKZP5iamQeLVAo2w3d/9TYmXoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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