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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd8283d7b174be63e3681f24d74f33efd5cadd3741b12769697870171d44896' 
  AND token = 'xcLpN07Gi3wbQvqQzZm3Stc60TUc8nLBPiWoIJP0VQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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