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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd152e689fda175624361ef760b940aa47816aa33d3999b52d93019717fda666' 
  AND token = 'zbVXbXYfE4X0a+2Bwg6VygwdNazRM00ZM8WTANBQF3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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