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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a5b8eec434b984a6d913d50f871c9a0cad4c165c6a60864c2557f0c98d28ace' 
  AND token = '9IFFhuzuUminehNbt4WPoJfJOKs+kGNDmTYl9zUgDco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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