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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60046f3529b1b2eeab1a94190567674e3679cda31944eb2d7146e8ab782e9807' 
  AND token = '0P2szxcYTn7SAvFdcPLU4mh+8R0g7kxVrvbmWs5enlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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