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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17c47b5087cb3e9f89738330bac3ff39282aa2613623006fb5067a395c3ecd1' 
  AND token = 'xF78ilh9b1h05+Xv+z++5z/5z9mrk05X7u7WXl4ezmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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