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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '148ce74a2a3f8501c7831826ce737cbda74b2e30da5e4fbf961511f632e0b85a' 
  AND token = 'Tvw2bkohV3JsimWEp1cuAe71soFIDnRk0DJlJpwKGd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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