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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c944770ac180ce06ad86e4d36f0345d491a64ee7c57b717c1d51f1ae5b88c894' 
  AND token = 'fUjMtnqleEFwdV7mhYKOrurC78is4k/Qq2Z0k1ESnPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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