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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46752b63e80ac4dda547ba2027482ebc5bced7e24f464ae04ca33fecbb4fb503' 
  AND token = 'A1wACGlJbwn+fhOHlBpnZoUG9ru1Cg2dPC82sVjI6XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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