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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b1bd26e366671da3214e20d0bc49bf8e1152bfb431693603b42c3d4d75c2b3' 
  AND token = 'udcr5yeKJ9BBjaKDbU1hMly1dxCmJmXh52XlR6761ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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