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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d68d2db48e78283b0470376331e94769023037f3a3103f39e4ed7e2bd382049' 
  AND token = 'F0ZKnnZGJAmSD2dfsxbnDmDeSpk1J2scL2RRa0F9rE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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