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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbac1e73510eb68541e3f878e46cc291838394a38982828107613d03c2a70ad' 
  AND token = '1VIUs22qzH94gcBl3x6FdbZdPA/L5WDH5YXTxpOaD48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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