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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32e8b3ba8804848dfc3292228ae4011464dd1a43fad971c94b5483870ba0016' 
  AND token = 'HqI/hOqQzSjNXv0MxAlbtx3+pCWC8fd4KHbhHpKcZCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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