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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9d43e4dcdbd6caca85e0b7b1914e56335035481021a1c68e4e594f264d08e5' 
  AND token = 'CbUeFYBJN+0DlXv6z8jP4QhR2w52jfiq0Su7ryLSfQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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