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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd170c90c06c33df7a5794b7944f9227edf46d2449fddb945486e84ab27126807' 
  AND token = '/HeYlMkxk9CaVylDyzZwv22N79jUFBWU1HASW8eUIBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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