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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8746ddecea1b0e5bd63f7c51a8fd373e32d2ab5f25e85ed1c74b3de3c2ab98' 
  AND token = 'tmrRikI3z85gbWBEroqRoh64xCH3amXFQib9LWFIFiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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