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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d98c19d8f9e002bdcadd46537b850177aeb4274e2b2afe07647f1d5097be5b' 
  AND token = 'IPGttRr42+K64sPRZSSbLnlgt7kfOsND8rAiY2U1p5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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