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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956fb12f5c28926546c8f77f4b00a6a0d144be08d58e30fb5ce3d8ed18ff889e' 
  AND token = 'M0Pj0Sy3zSLjY/utG+HUhdczRRykSq1+zXrpeCcfK7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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