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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd7bd72024e5a70c21457fec0f7c5db27a832edefb71e756f89e2b1d7b56077' 
  AND token = 'RBFDwl4/DUocaLxLEtnx9NLpnqoUKbcfvSuTx5pB+Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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