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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767e4ab9bb50ffdfbe78b8c3e2f727000bd288d90f1212cf6fb14b34a6845ccc' 
  AND token = 'mSTpnwB+oy5+jSt3jX53F+/OX8o6RgNKqpTHdfz69ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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