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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd749f3108f1e21b0fe6b41b04dac925b244f2548506a1344c0844cb5b7ee25cb' 
  AND token = 'WbVeKNX/ugztAIW7w/SYyOG0+5rXX0Xj/04ayS2i16Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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