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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea85420e0e9f470d5fa9aaf933c409004d99cfb8dbcf16d590c15dfcf21f515' 
  AND token = 'QKm8qhl6pR7msprKpiHG8+q8AEMFW/3Uiiriqw86VKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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