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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c194be84a0108179df0875390007e3ab5924003903e63f41678514f66764f368' 
  AND token = 'y4Zo+kFTDU0Ui/Yv0vedmIX/eAGlwj/Qv4/CRTi+xns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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