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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06be292a09ad6c36920f2ea1843290bf008d69847339a4abe2d3cf2dc547e47b' 
  AND token = 'TYPFTnQr1lVNMYXxo2eazENopmPUmEBNXyDIGQ56D1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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