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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f5582c22e123328ae2b86408fc8d78e3abb26d9cc80593cee5f9cc803485c6' 
  AND token = 'k5hbro/ZU/ImEfblqyR19ybYmtDruLMZqx/1EeGRJZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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