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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7708767afdcdce337d19e3edd29d42e87f28dca1dd40728fe409bd7726148026' 
  AND token = 'VUQ2GEewP9eljNTyyxieMy/ZIzPEkPA+3ijlxwXxFjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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