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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67492c14f424f6ee602505691c867273c4e585a2f2772bb18d279ee6222d273a' 
  AND token = 'ui8vmfC1paAXRveSTnyuAhaHDs4fdu0frG7RaeIwSSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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