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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4988e5b82d6c8de759e701bcb155945f164dd6b8288555f249855595d8529583' 
  AND token = 'w1hEi/YKFWUJ5YtcvcL1LsRMkKdsIH5oBbSF6FP/8po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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