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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9838771ab1863acb4c9c9be973b41309061daaa312d5ed2c45e5de0ba517d41' 
  AND token = 'xzHLsDMBaH17Bq1HaEgBqwGjqPs/mPPoU/MqVb1T84U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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