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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf7c26772e7535f80f3b37193f05a8d1788651a95015c58eeed92b0a12c72f9' 
  AND token = 'nIYVLGFV4O/xeN/KKE6WGfJqXptf5WxcquE6Es5nQuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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