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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13d69e5fd3bfe034c58f3ee52b8f142cab566e025221e935c50e59844dc0ea9' 
  AND token = 'diiceF5v8Bpbys0+z5ypWIScy/yYUEVAXZPFPjbWSBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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