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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde5c20f9e8d74adbb99e30d59571cfb7c860891e81402875d5afc68b40cdedd' 
  AND token = '69fwHAwHt2NAgPIuRZiobIGUTCGMXoyxcIAoq9Sf8ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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